<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>逛水果店</title>
</head>
<style>
    * {
        margin: 0;
        padding: 0;
    }

    div {
        text-align: center;
    }

    table {
        margin: 0 auto
    }
</style>

<body>
    <div id="app">
        <h4>欢迎光临_vue开发的收银系统_水果店</h4>
        <table border="1" width="600" height="100">
            <caption>
                苹果10￥/斤，折扣/《8折》
            </caption>
            <tbody>
                <tr>
                    <td>
                        <span>请输入你要购买的斤数</span>
                        <input type="number" placeholder="请输入斤数" v-model.number="goodCatty" />
                    </td>
                </tr>
                <tr>
                    <td>
                        <button @click="payMoney">结账买单</button>
                    </td>
                </tr>
            </tbody>
        </table>
        <p>结账单：总价:{{totalPrice}}元 折后价:{{totalPrice * 0.8}}元 省了:{{totalPrice * 0.2}}元</p>
    </div>
</body>

</html>
<script src="vue.js"></script>
<script>
    new Vue({
        el: '#app',
        data: {
            goodCatty: 0,
            totalPrice: 0
        },
        methods: {
            payMoney() {
                this.totalPrice = parseInt(this.goodCatty.toFixed(2) * 100) / 10
            }
        }
    })
</script>